• 技术文章 >web前端 >H5教程

    HTML5 Canvas实现烟花绽放特效_html5教程技巧

    2016-05-16 15:45:41原创2303

    本文为大家带来了一款，免费而又安全环保的HTML5 Canvas实现的放烟花特效。

    效果如下：

    代码如下：

    XML/HTML Code复制内容到剪贴板
    1. >
    2. <html>
    3. <head>
    4. <title>Canvas 实现放烟花特效title>
    5. <meta charset="utf-8">
    6. <meta http-equiv="X-UA-Compatible" content="IE=edge">
    7. <meta name="viewport" content="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0,user-scalable=no">
    8. <style type="text/css">
    9. html,body{height:100%;margin:0;padding:0}
    10. ul,li{text-indent:0;text-decoration:none;margin:0;padding:0}
    11. img{border:0}
    12. body{background-color:#000;color:#999;font:100%/18px helvetica, arial, sans-serif}
    13. canvas{cursor:crosshair;display:block;left:0;position:absolute;top:0;z-index:20}
    14. #header img{width:100%; height:20%;}
    15. #bg img{width:100%; height:80%;}
    16. #header,#bg{position:fixed;left:0;right:0;z-index:10}
    17. #header{top:0}
    18. #bg{position:fixed;z-index:1;bottom:0}
    19. audio{position:fixed;display:none;bottom:0;left:0;right:0;width:100%;z-index:5}
    20. style>
    21. head>
    22. <body>
    23. <div id="bg">
    24. <img id="bgimg" src="http://img.ivsky.com/img/tupian/pre/201508/02/yuzhou_xingkong_yu_yueliang-006.jpg">
    25. div>
    26. <script src="http://cdn.bootcss.com/jquery/2.2.0/jquery.min.js">script>
    27. <script>
    28. $(function(){
    29. var Fireworks = function(){
    30. var self = this;
    31. // 产生烟花随机数
    32. var rand = function(rMi, rMa){
    33. //按位取反运算符
    34. return ~~((Math.random()*(rMa-rMi+1))+rMi);
    35. },hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2){
    36. return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);
    37. };
    38. //请求动画帧
    39. window.requestAnimFrame=function(){
    40. return window.requestAnimationFrame
    41. ||window.webkitRequestAnimationFrame
    42. ||window.mozRequestAnimationFrame
    43. ||window.oRequestAnimationFrame
    44. ||window.msRequestAnimationFrame
    45. ||function(callback){
    46. window.setTimeout(callback,1000/60);
    47. }
    48. }();
    49. self.init = function(){
    50. self.canvas = document.createElement('canvas');
    51. //canvas 全屏
    52. selfself.canvas.width = self.cw = $(window).innerWidth();
    53. selfself.canvas.height = self.ch = $(window).innerHeight();
    54. self.particles = [];
    55. self.partCount = 150;
    56. self.fireworks = [];
    57. selfself.mx = self.cw/2;
    58. selfself.my = self.ch/2;
    59. self.currentHue = 30;
    60. self.partSpeed = 5;
    61. self.partSpeedVariance = 10;
    62. self.partWind = 50;
    63. self.partFriction = 5;
    64. self.partGravity = 1;
    65. self.hueMin = 0;
    66. self.hueMax = 360;
    67. self.fworkSpeed = 4;
    68. self.fworkAccel = 10;
    69. self.hueVariance = 30;
    70. self.flickerDensity = 25;
    71. self.showShockwave = true;
    72. self.showTarget = false;
    73. self.clearAlpha = 25;
    74. $(document.body).append(self.canvas);
    75. selfself.ctx = self.canvas.getContext('2d');
    76. self.ctx.lineCap = 'round';
    77. self.ctx.lineJoin = 'round';
    78. self.lineWidth = 1;
    79. self.bindEvents();
    80. self.canvasLoop();
    81. self.canvas.onselectstart = function() {
    82. return false;
    83. };
    84. };
    85. // 创建粒子
    86. self.createParticles = function(x,y, hue){
    87. var countdown = self.partCount;
    88. while(countdown--){
    89. var newParticle = {
    90. x: x,
    91. y: y,
    92. coordLast: [
    93. {x: x, y: y},
    94. {x: x, y: y},
    95. {x: x, y: y}
    96. ],
    97. angle: rand(0, 360),
    98. speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)),
    99. friction: 1 - self.partFriction/100,
    100. gravity: self.partGravity/2,
    101. hue: rand(hue-self.hueVariance, hue+self.hueVariance),
    102. brightness: rand(50, 80),
    103. alpha: rand(40,100)/100,
    104. decay: rand(10, 50)/1000,
    105. wind: (rand(0, self.partWind) - (self.partWind/2))/25,
    106. lineWidth: self.lineWidth
    107. };
    108. self.particles.push(newParticle);
    109. }
    110. };
    111. // 更新粒子
    112. self.updateParticles = function(){
    113. var i = self.particles.length;
    114. while(i--){
    115. var p = self.particles[i];
    116. var radians = p.angle * Math.PI / 180;
    117. var vx = Math.cos(radians) * p.speed;
    118. var vy = Math.sin(radians) * p.speed;
    119. p.speed *= p.friction;
    120. p.coordLast[2].x = p.coordLast[1].x;
    121. p.coordLast[2].y = p.coordLast[1].y;
    122. p.coordLast[1].x = p.coordLast[0].x;
    123. p.coordLast[1].y = p.coordLast[0].y;
    124. p.coordLast[0].x = p.x;
    125. p.coordLast[0].y = p.y;
    126. p.x += vx;
    127. p.y += vy;
    128. p.y += p.gravity;
    129. p.angle += p.wind;
    130. p.alpha -= p.decay;
    131. if(!hitTest(0,0,self.cw,self.ch,p.x-p.radius, p.y-p.radius, p.radius*2, p.radius*2) || p.alpha < .05){
    132. self.particles.splice(i, 1);
    133. }
    134. };
    135. };
    136. // 绘制粒子
    137. self.drawParticles = function(){
    138. var i = self.particles.length;
    139. while(i--){
    140. var p = self.particles[i];
    141. var coordRand = (rand(1,3)-1);
    142. self.ctx.beginPath();
    143. self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));
    144. self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
    145. self.ctx.closePath();
    146. self.ctx.strokeStyle = 'hsla('+p.hue+', 100%, '+p.brightness+'%, '+p.alpha+')';
    147. self.ctx.stroke();
    148. if(self.flickerDensity > 0){
    149. var inverseDensity = 50 - self.flickerDensity;
    150. if(rand(0, inverseDensity) === inverseDensity){
    151. self.ctx.beginPath();
    152. self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth,p.lineWidth+3)/2, 0, Math.PI*2, false)
    153. self.ctx.closePath();
    154. var randrandAlpha = rand(50,100)/100;
    155. self.ctx.fillStyle = 'hsla('+p.hue+', 100%, '+p.brightness+'%, '+randAlpha+')';
    156. self.ctx.fill();
    157. }
    158. }
    159. };
    160. };
    161. // 创建烟花
    162. self.createFireworks = function(startX, startY, targetX, targetY){
    163. var newFirework = {
    164. x: startX,
    165. y: startY,
    166. startX: startX,
    167. startY: startY,
    168. hitX: false,
    169. hitY: false,
    170. coordLast: [
    171. {x: startX, y: startY},
    172. {x: startX, y: startY},
    173. {x: startX, y: startY}
    174. ],
    175. targetX: targetX,
    176. targetY: targetY,
    177. speed: self.fworkSpeed,
    178. angle: Math.atan2(targetY - startY, targetX - startX),
    179. shockwaveAngle: Math.atan2(targetY - startY, targetX - startX)+(90*(Math.PI/180)),
    180. acceleration: self.fworkAccel/100,
    181. hue: self.currentHue,
    182. brightness: rand(50, 80),
    183. alpha: rand(50,100)/100,
    184. lineWidth: self.lineWidth
    185. };
    186. self.fireworks.push(newFirework);
    187. };
    188. // 更新烟花
    189. self.updateFireworks = function(){
    190. var i = self.fireworks.length;
    191. while(i--){
    192. var f = self.fireworks[i];
    193. self.ctx.lineWidth = f.lineWidth;
    194. vx = Math.cos(f.angle) * f.speed,
    195. vy = Math.sin(f.angle) * f.speed;
    196. f.speed *= 1 + f.acceleration;
    197. f.coordLast[2].x = f.coordLast[1].x;
    198. f.coordLast[2].y = f.coordLast[1].y;
    199. f.coordLast[1].x = f.coordLast[0].x;
    200. f.coordLast[1].y = f.coordLast[0].y;
    201. f.coordLast[0].x = f.x;
    202. f.coordLast[0].y = f.y;
    203. if(f.startX >= f.targetX){
    204. if(f.x + vx <= f.targetX){
    205. ff.x = f.targetX;
    206. f.hitX = true;
    207. } else {
    208. f.x += vx;
    209. }
    210. } else {
    211. if(f.x + vx >= f.targetX){
    212. ff.x = f.targetX;
    213. f.hitX = true;
    214. } else {
    215. f.x += vx;
    216. }
    217. }
    218. if(f.startY >= f.targetY){
    219. if(f.y + vy <= f.targetY){
    220. ff.y = f.targetY;
    221. f.hitY = true;
    222. } else {
    223. f.y += vy;
    224. }
    225. } else {
    226. if(f.y + vy >= f.targetY){
    227. ff.y = f.targetY;
    228. f.hitY = true;
    229. } else {
    230. f.y += vy;
    231. }
    232. }
    233. if(f.hitX && f.hitY){
    234. self.createParticles(f.targetX, f.targetY, f.hue);
    235. self.fireworks.splice(i, 1);
    236. }
    237. };
    238. };
    239. // 绘制烟花
    240. self.drawFireworks = function(){
    241. var i = self.fireworks.length;
    242. self.ctx.globalCompositeOperation = 'lighter';
    243. while(i--){
    244. var f = self.fireworks[i];
    245. self.ctx.lineWidth = f.lineWidth;
    246. var coordRand = (rand(1,3)-1);
    247. self.ctx.beginPath();
    248. self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));
    249. self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
    250. self.ctx.closePath();
    251. self.ctx.strokeStyle = 'hsla('+f.hue+', 100%, '+f.brightness+'%, '+f.alpha+')';
    252. self.ctx.stroke();
    253. if(self.showTarget){
    254. self.ctx.save();
    255. self.ctx.beginPath();
    256. self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1,8), 0, Math.PI*2, false)
    257. self.ctx.closePath();
    258. self.ctx.lineWidth = 1;
    259. self.ctx.stroke();
    260. self.ctx.restore();
    261. }
    262. if(self.showShockwave){
    263. self.ctx.save();
    264. self.ctx.translate(Math.round(f.x), Math.round(f.y));
    265. self.ctx.rotate(f.shockwaveAngle);
    266. self.ctx.beginPath();
    267. self.ctx.arc(0, 0, 1*(f.speed/5), 0, Math.PI, true);
    268. self.ctx.strokeStyle = 'hsla('+f.hue+', 100%, '+f.brightness+'%, '+rand(25, 60)/100+')';
    269. self.ctx.lineWidth = f.lineWidth;
    270. self.ctx.stroke();
    271. self.ctx.restore();
    272. }
    273. };
    274. };
    275. // 绑定事件
    276. self.bindEvents = function(){
    277. $(window).on('resize', function(){
    278. clearTimeout(self.timeout);
    279. self.timeout = setTimeout(function() {
    280. selfself.canvas.width = self.cw = $(window).innerWidth();
    281. selfself.canvas.height = self.ch = $(window).innerHeight();
    282. self.ctx.lineCap = 'round';
    283. self.ctx.lineJoin = 'round';
    284. }, 100);
    285. });
    286. $(self.canvas).on('mousedown', function(e){
    287. self.mx = e.pageX - self.canvas.offsetLeft;
    288. self.my = e.pageY - self.canvas.offsetTop;
    289. self.currentHue = rand(self.hueMin, self.hueMax);
    290. self.createFireworks(self.cw/2, self.ch, self.mx, self.my);
    291. $(self.canvas).on('mousemove.fireworks', function(e){
    292. self.mx = e.pageX - self.canvas.offsetLeft;
    293. self.my = e.pageY - self.canvas.offsetTop;
    294. self.currentHue = rand(self.hueMin, self.hueMax);
    295. self.createFireworks(self.cw/2, self.ch, self.mx, self.my);
    296. });
    297. });
    298. $(self.canvas).on('mouseup', function(e){
    299. $(self.canvas).off('mousemove.fireworks');
    300. });
    301. };
    302. self.clear = function(){
    303. self.particles = [];
    304. self.fireworks = [];
    305. self.ctx.clearRect(0, 0, self.cw, self.ch);
    306. };
    307. self.canvasLoop = function(){
    308. requestAnimFrame(self.canvasLoop, self.canvas);
    309. self.ctx.globalCompositeOperation = 'destination-out';
    310. self.ctx.fillStyle = 'rgba(0,0,0,'+self.clearAlpha/100+')';
    311. self.ctx.fillRect(0,0,self.cw,self.ch);
    312. self.updateFireworks();
    313. self.updateParticles();
    314. self.drawFireworks();
    315. self.drawParticles();
    316. };
    317. self.init();
    318. }
    319. var fworks = new Fireworks();
    320. $('#info-toggle').on('click', function(e){
    321. $('#info-inner').stop(false, true).slideToggle(100);
    322. e.preventDefault();
    323. });
    324. });
    325. script>
    326. <canvas width="1400" height="449">canvas>
    327. body>
    328. html>

    是不是被HTML5强大的效果惊呆了，一饱眼福了吧。

    声明：本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn核实处理。
    专题推荐：HTML5 Canvas 烟花绽放
    上一篇：HTML5 Canvas入门学习教程_html5教程技巧 下一篇：自己动手写 PHP MVC 框架(40节精讲/巨细/新人进阶必看)

    相关文章推荐

    • H5你真的了解吗？（绝对干货）• 小强的HTML5移动开发之路（11）——链接，图片，表格，框架• 小强的HTML5移动开发之路（16）——神奇的拖放功能• 小强的HTML5移动开发之路（19）——HTML5 Local Storage（本地存储）• 小强的HTML5移动开发之路（48）——（小练习）新闻订阅系统【1】
    1/1

    PHP中文网

    首页 首页课程 课程文章文章问答 问答博客博客词典 词典手册 手册资源 资源搜索 搜索APP下载 APP下载